Enhanced MicroChannel Heat Transfer in Macro-Geometry using Conventional Fabrication Approach

7th European Thermal-Sciences Conference

Ooi, K.T.^1 ; Goh, A.L.^2

School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore

639798, Singapore^1

TUM-CREATE, Nanyang Technological University, Singapore

639798, Singapore^2

关键词: Annular gap;    Diameter channels;    Enhanced microchannels;    Fabrication technique;    Heat transfer capability;    Hydraulic diameter;    Macro scale;    Single phase;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/745/3/032054/pdf
DOI  :  10.1088/1742-6596/745/3/032054

来源: IOP

【 摘 要 】

This paper presents studies on passive, single-phase, enhanced microchannel heat transfer in conventionally sized geometry. The intention is to allow economical, simple and readily available conventional fabrication techniques to be used for fabricating macro-scale heat exchangers with microchannel heat transfer capability. A concentric annular gap between a 20 mm diameter channel and an 19.4 mm diameter insert forms a microchannel where heat transfer occurs. Results show that the heat transfer coefficient of more than 50 kW/m•K can be obtained for Re≈4,000, at hydraulic diameter of 0.6 mm. The pressure drop values of the system are kept below 3.3 bars. The present study re-confirms the feasibility of fabricating macro-heat exchangers with microchannel heat transfer capability.